Could you take over a bunch of clothes instead (and carry the more unusual stuff when you have visa in hand and are moving)?
I managed to fit about 75% of my clothing into 2 suitcases, plus cram about 1/3 of my DVDs in there as well on my recent visit. (I've got citizenship, so I wasn't really concerned with the items I was packing, but I was surprised at how much stuff fit.) Granted, I've also gotten rid of a ton of stuff as well, so my goal is to move over with only clothes, dvds/electronics, and whatever stuff my pets need.
You can also help avoid suspicion by bringing along very clear evidence that you're not staying in the UK and will be moving in April/May. (Lease agreement/mortgage, employment letter, etc.) It may not be enough to avoid the 7-hour angst that Marlespo dealt with, but at least should enable you to get in the country without a bounce. You can also clarify to the IO that you're aware of the visa procedures and have every intention of following them, etc.
At any rate, good luck! I hope you have a lovely visit.
